Method of making a plastic mass from compound of tungsten, &amp;c.



UNITED STATES PATENT OFFICE. HANSKREUSLER, or wrnmnnsnonr, NEAR. BERLIN,GERMANZ-ASSI-GNOR TO 'sm- :uENs & HALSKE A. e., or BERLIN, GERMANY, AconroRATIoN or GERMANY.

' METHOD llIAKING A PLLSTlIC MASS rnom COMPOUND or TUNGSTEN, &c.

NoDrawing.

To all whom 'it may concem;

Be it known that I, HANS Knnusnnn, a

- subject of the German Em eror, residing at Wilmersdorf, near Berlin,ermany, have invented a certain new and useful Improvement in Methods ofMaking a Plastic Mass from Compounds of Tungsten, &c., of which thefollowing is a specification.

The present invention relates to a method of making a plastic mass'fromtungsten compounds.

An important object of the invention istoprovide a plastic mass whichpossesses adhesive qualities similar toglue, and which 1 may be easilydrawn into long threads or filaments ina manner which will be clear tothose skilled in the art of manufacturing filaments for incandescentlamps.

In accordance with iny invention dry acid tungstateof ammonium, to whichmetatungstate of ammonium belongs, is placed in a composition would takeplace and the (proper working of the process be interfere Wlth.

The heating is continued a length of time i dependent? upon the quantityof the acid ably the sufiiciencyof the time of heating. When themass-cools the dull green color disappears. The final product, which isammoniumtungstate until the mass assumes a dull green color, and untilno more ammonia is driven ofi. If for example 100 grams of the acidtungstate of ammonium is employed, this will require about twentyminutes. The dull green color and the cessation of animonia will'indicate unmistakfipeciflcation of Letters Patent. Application filedJune 22, 1907. Serial No. 380,356.

. thus obtained is slightly soluble in water at ordinary temperature andyields a viscous paste in hot water or after it is boiled for a shorttime in water, and this paste is of a glassy or horny appearance andcolorless or only weakly colored, and transparent and adheres like glueand may be drawn into threads or filaments if too much water PatentedMay 3, 19'1o.

has not been employed. The threads or fil-- aments which are obtained inthis manner may by suitable treatment be rendered suitable for use asfilaments in electric incandescent lamps. Furthermore the viscous massjust described may be employed with par.-

ticular advantage as an agglutinant for a paste of tun sten oxids inconnectlon with the process escribed in my oo-pending application, Ser.No. 372,371, filed May 7th, 1907, for method of making filaments Iclaim: 1. A method of 'making a plastic mass from compounds of tungstenconsisting in heating dry acid tungstate of ammonium in a vacuum toabout 270 C.'until ammonia is no longer generated, in allowing theheated mass to cool, and in then placing the same in hot water whereby aviscous paste is ob tained.-

2. A. method of making .a plastic mass from compounds .of tungstenconsisting in heating dry acid tungsta'te of ammomum in 'vacuum to about270 C. until ammonia is no longer enerated, in allowing the heated massto coo, and in then boiling the same in water, whereby a vlscous mass 1sobtalned.

In testimony whereof, I have signed my name to this specification in thepresence of the two subscribing witnesses.

HANS KREUS LER.

. Witnesses i HENRY HAsPER,

WOLDEMAR HAUPT.

